College Physics: A Strategic Approach (3rd Edition)
3rd Edition
ISBN: 9780321879721
Author: Randall D. Knight (Professor Emeritus), Brian Jones, Stuart Field
Publisher: PEARSON
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Textbook Question
Chapter 5, Problem 55GP
Seat belts and air bags save lives by reducing the forces exerted on the driver and passengers in an automobile collision. Cars are designed with a “crumple zone” in the front of the car. In the event of an impact, the passenger compartment decelerates over a distance of about 1 m as the front of the car crumples. An occupant restrained by seat belts and air bags decelerates with the car. By contrast, an unrestrained occupant keeps moving forward with no loss of speed (Newton’s first law!) until hitting the dashboard or windshield, as we saw in Figure 4.2. These are unyielding surfaces, and the unfortunate occupant then decelerates over a distance of only about 5 mm.
a. A 60 kg person is in a head-on collision. The car’s speed at impact is 15 m/s. Estimate the net force on the person if he or she is wearing a seat belt and if the air bag deploys.
b. Estimate the net force that ultimately stops the person if he or she is not restrained by a seat belt or air bag.
c. How do these two forces compare to the person’s weight?
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Seat belts and air bags save lives by reducing the forces exerted on
the driver and passengers in an automobile collision. Cars are
designed with a "crumple zone" in the front of the car. In the event of
an impact, the passenger compartment decelerates over a distance of
about 1 m as the front of the car crumples. An occupant restrained by
seat belts and air bags decelerates with the car. By contrast, an
unrestrained occupant keeps moving forward with no loss of speed
(Newton's first law!) until hitting the dashboard or windshield. These
are unyielding surfaces, and the unfortunate occupant then
decelerates over a distance of only about 5 mm.
Part A
A 62 kg person is in a head-on collision. The car's speed at impact is 13 m/s. Estimate the net force on the person if he or she is wearing a seat belt and if the air bag
deploys.
Express your answer with the appropriate units.
Part B
Estimate the net force that ultimately stops the person if he or she is not restrained by a seat belt or…
Seat belts and air bags save lives by reducing the forces exerted on the driver and passengers in an automobile collision. Cars are designed with a “crumple zone” in the front of the car. In the event of an impact, the passenger compartment decelerates over a distance of about 1 m as the front of the car crumples. An occupant restrained by seat belts and air bags decelerates with the car. By contrast, an unrestrained occupant keeps moving forward with no loss of speed (Newton’s first law!) until hitting the dashboard or windshield, as shown. These are unyielding surfaces, and the unfortunate occupant then decelerates over a distance of only about 5 mm.
a. A 60 kg person is in a head-on collision. The car’s speed at impact is 15 m/s. Estimate the net force on the person if he or she is wearing a seat belt and if the air bag deploys.b. Estimate the net force that ultimately stops the person if he or she is not restrained by a seat belt or air bag.c. How do these two forces compare to the…
Seat belts and air bags save lives by reducing the forces
exerted on the driver and passengers in an automobile
collision. Cars are designed with a "crumple zone" in the front
of the car. In the event of an impact, the passenger
compartment decelerates over a distance of about 1 m as the
front of the car crumples. An occupant restrained by seat belts
and air bags decelerates with the car. By contrast, an
unrestrained occupant keeps moving forward with no loss of
speed (Newton's first law!) until hitting the dashboard or
windshield. These are unyielding surfaces, and the
unfortunate occupant then decelerates over a distance of only
about 5 mm.
Part A
A 65 kg person is in a head-on collision. The car's speed at impact is 12 m/s. Estimate the net force on the person if he or she is wearing a seat belt
and if the air bag deploys.
Express your answer with the appropriate units.
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Part B
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Request Answer
Estimate the net force that ultimately stops the person if…
Chapter 5 Solutions
College Physics: A Strategic Approach (3rd Edition)
Ch. 5 - An object is subject to two forces that do not...Ch. 5 - Are the objects described here in static...Ch. 5 - What forces are acting on you right now? What net...Ch. 5 - Decide whether each of the following is true or...Ch. 5 - An astronaut takes his bathroom scale to the moon...Ch. 5 - A light block of mass m and a heavy block of mass...Ch. 5 - a. Can the normal force on an object be directed...Ch. 5 - A ball is thrown straight up. Taking the drag...Ch. 5 - You are going sledding with your friends, sliding...Ch. 5 - Suppose you are holding a box in front of you and...
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